* fix bbox_loss in fovea_head.py when num_pos=0

* Remove PIL from .isort.cfg

* Make loss_bbox scalar in fovea_head.py when num_pos==0

* Sum based reduction for loss_bbox in fovea_head

* reverting to scalar implementation

* refactor resnet, add deep_stem and avg_down opt

* move args into kwargs

* add default

* mv resnetv1d to resnet

* fixed res_layer

* add base_channels

* add doc

* add tests

* update test

* fixed backbone block conv_cfg/norm_cfg

* add test

* add tests

* add onnx convert script

* upload pytorch2onnx.py

* restore config

* set use_torchvion on-the-fly, update doc

* update doc

* support pass input

* fixed passes

* reimplement cityscapes

* fixed gt bbox mode

* convert cityscapes to coco style, add cityscapes eval

* add cityscapes convert script

* add doc

* Update INSTALL.md

* Update INSTALL.md

* update fater rcnn

* fix cityscapes eval

* support format only in cityscapes

* add docs

* remove redundancy

* resolve eval

* update cityscapes md

* more doc and rename

* update doc and cfg

* change to test set

* add soft_nms_cpu

* remove cython dependency

* merge soft_nms_cpu.cpp into nms_cpu.cpp

* add docs

* fixed typo

* fixed typo

* fixed typo

* add GN support for flops computation

* remove useless lines

* modify the flops computation for gn

* collect env info for trouble shoting

* minor fix

* update the issue template

* fix the travis building

* update setup classifiers

* update to v1.0rc1

* update maintainers

* Added pre-commit hook

* Trigger CI

* add isort config

* use isort to sort imports

* add isort to travis